char *GLSLShaders::ReturnFileAsString( char *filename )
{
	/* open the file */
	FILE *file = fopen( filename, "r" );
	if (!file && verbose)
		printf("**** Error opening file '%s'\n", filename );

	/* get the length of the file */
	fseek( file, 0, SEEK_END );
	long size = ftell( file );
	rewind( file );

	/* allocate memory for the shader string */
	char *shaderMemory = (char *)calloc( (size+1), sizeof(char) );
	if (!shaderMemory) { fclose(file); return 0; }

	/* read shader data from the file */
	long bytesRead = fread (shaderMemory,1,size,file);

	/* On Windows platforms fread() strips out '\r' characters, so the */
	/*    number of bytes read is less than the file size.  This can   */
	/*    add garbage at the end of the shader if the null-termination */
	/*    occurs at the end of the buffer, since only part of it may   */
	/*    be filled by fread().  This should fix that.                 */
	size = ( bytesRead < size ? bytesRead : size );
	shaderMemory[size] = 0;

	/* clean up and return the data */
	fclose(file);
	return shaderMemory;
}